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🚫 '''Cyber exclusion''' is a [[Definition:Policy exclusion | policy exclusion]] clause embedded in traditional [[Definition:Insurance policy | insurance policies]] — most commonly [[Definition:Property insurance | property]], [[Definition:General liability insurance | general liability]], and [[Definition:Professional liability insurance | professional liability]] forms — that removes or restricts coverage for losses arising from cyber events such as data breaches, ransomware attacks, or network outages. The clause emerged as insurers recognized that legacy policy wordings, drafted before the digital era, could be interpreted to cover cyber-related damages never contemplated when the [[Definition:Insurance premium | premiums]] were priced.

⚙️ These exclusions typically function by carving out losses attributable to unauthorized access to computer systems, malicious code, or the failure of electronic infrastructure, though exact language varies by carrier and market. Lloyd's of London, for instance, issued market bulletins requiring [[Definition:Lloyd's syndicate | syndicates]] to include clear cyber exclusions — or affirmative cyber coverage — in all [[Definition:Property insurance | property]] policies from 2023 onward, addressing the so-called "silent cyber" problem where neither the insurer nor the [[Definition:Policyholder | policyholder]] knew whether a cyber loss was covered. When an exclusion is absolute, any cyber-related component of a claim is denied outright; limited versions may exclude only certain categories, such as acts of [[Definition:Cyber warfare | cyber warfare]], while preserving coverage for accidental system failures. [[Definition:Underwriting | Underwriters]] must carefully draft and review these clauses to avoid ambiguity that could lead to costly [[Definition:Coverage dispute | coverage disputes]] and [[Definition:Litigation | litigation]].

🔍 The practical significance of cyber exclusions extends to both carriers and the businesses they insure. For insurers, clear exclusionary language protects against unquantified [[Definition:Accumulation risk | accumulation risk]] lurking inside non-cyber portfolios — a single widespread cyberattack could otherwise trigger claims across thousands of property and liability policies simultaneously. For policyholders, encountering a cyber exclusion is often the catalyst to purchase dedicated [[Definition:Cyber liability insurance | cyber liability coverage]], which is specifically designed and priced to address digital perils. [[Definition:Insurance broker | Brokers]] play a critical advisory role here, conducting gap analyses to ensure clients understand where traditional policies stop and standalone cyber coverage should begin.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Cyber liability insurance]]
* [[Definition:Silent cyber]]
* [[Definition:Policy exclusion]]
* [[Definition:Accumulation risk]]
* [[Definition:Cyber incident]]
* [[Definition:Affirmative cyber coverage]]
{{Div col end}}

Definition:Cyber exclusion - Revision history

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